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<?phprequire__DIR__.'/../vendor/autoload.php';useGuzzleHttp\Client;useThibaudDauce\Mattermost\Mattermost;useThibaudDauce\Mattermost\Message;useThibaudDauce\Mattermost\Attachment;$mattermost=newMattermost(newClient);$message= (newMessage)->text('This is a *test*.')->channel('tests')->username('A Tester')->iconUrl('https://upload.wikimedia.org/wikipedia/fr/f/f6/Phpunit-logo.gif')->attachment(function (Attachment$attachment) {$attachment->fallback('This is the fallback test for the attachment.')->success()->pretext('This is optional pretext that shows above the attachment.')->text('This is the text. **Finaly!**')->authorName('Mattermost')->authorIcon('http://www.mattermost.org/wp-content/uploads/2016/04/icon_WS.png')->authorLink('http://www.mattermost.org/')->title('Example attachment', 'http://docs.mattermost.com/developer/message-attachments.html')->field('Long field', 'Testing with a very long piece of text that will take up the whole width of the table. And then some more text to make it extra long.', false)->field('Column one', 'Testing.', true)->field('Column two', 'Testing.', true)->field('Column one again', 'Testing.', true)->imageUrl('http://www.mattermost.org/wp-content/uploads/2016/03/logoHorizontal_WS.png')->action(['name'=>'Some button text','url'=>'https://my-post-api.example.org','context'=> ['user_id'=>'123','secret_key'=>'bépo22', ], ]); });$mattermost->send($message, 'https://your_mattermost_webhook_url');

You can play with it by running php tests/test.php after setting your incoming webhook URL for your server.